Gas mixing device

Abstract

A gas distributor with critical nozzles is proposed, the nozzle cross-sections increasing by 1:2 from one to the next, and each of these nozzles being capable of admitting either a test gas or a zero gas. With four nozzles of this type, 16 linearly graduated concentrations of the test gas in the zero gas are obtained.

I claim: 
     
       1. A gas mixing device comprising: a. a mixing chamber; and   b. a plurality of critical nozzles having their outputs connected to said mixing chamber, the cross-sections of said critical nozzles increasing by a proportion of 1:2 from one to the next, and each critical nozzle having inputs to receive either a test gas or a zero gas, wherein said plurality of critical nozzles comprise four nozzles whose cross-sections are in proportions of 1:2:4:8.   
     
     
       2. The device according to claim 1, wherein said inputs to receive either a test gas or a zero gas comprise a plurality of valves, each having two inlets, said inlets capable of being alternatively opened, one of said valves disposed upstream from each critical nozzle. 
     
     
       3. The device according to claim 2, wherein the nozzle with the largest cross-section is disposed opposite the output of said mixing chamber. 
     
     
       4. The device according to claim 2, and further including a microprocessor coupled to activate the valves, said microprocessor also monitoring and regulating the gas pressures. 
     
     
       5. The device according to claim 4, and further including: a. a host computer;   b. a communication line coupling said microprocessor to said host computer.   
     
     
       6. The device according to claim 2, wherein said valves are remotely controllable, electromagnetically actuated valves. 
     
     
       7. The device according to claim 6, wherein the nozzle with the largest cross-section is disposed opposite the output of said mixing chamber. 
     
     
       8. The device according to claim 6 and further including a position transducer for each valve. 
     
     
       9. The device according to claim 8, wherein the nozzle with the largest cross-section is disposed opposite the output of said mixing chamber. 
     
     
       10. The device according to claim 2 and further including a position transducer for each valve. 
     
     
       11. The device according to claim 10, wherein the nozzle with the largest cross-section is disposed opposite the output of said mixing chamber. 
     
     
       12. The device according to claim 1, and further including a microprocessor coupled to activate the valves, said microprocessor also monitoring and regulating the gas pressures. 
     
     
       13. The device according to claim 12, and further including: a. a host computer;   b. a communication line coupling said microprocessor to said host computer.   
     
     
       14. The device according to claim 1, wherein the nozzle with the largest cross-section is disposed opposite the output of said mixing chamber. 
     
     
       15. The device according to claim 1, wherein the nozzle with the largest cross-section is disposed opposite the output of said mixing chamber.